Questions about Moto G notification light

I just got my moto g LTE a few days ago, and have a few question. With the notification light, what actually triggers it? For instance, when I get a message from kik, it lights up. But when I get a notification from clash of clans or something, it doesn't. Is that normal? Also, I woke up this morning and saw it blinking funny. It was like dimmer, and like going dimmer instead of staying solid bright white. I tested with another notification, and it was fine. Was it just because it was on for so long, or us it supposed to do that?